Bug 2468222 (CVE-2026-43353)

Summary: CVE-2026-43353 kernel: i3c: mipi-i3c-hci: Fix race in DMA ring dequeue
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's i3c: mipi-i3c-hci module. A race condition in the `hci_dma_dequeue_xfer()` function allows parallel calls to interfere with each other when multiple transfers time out concurrently. This interference can cause the DMA ring to stop or restart unexpectedly, potentially leading to system instability or a denial of service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-08 15:05:34 UTC 
In the Linux kernel, the following vulnerability has been resolved:

i3c: mipi-i3c-hci: Fix race in DMA ring dequeue

The HCI DMA dequeue path (hci_dma_dequeue_xfer()) may be invoked for
multiple transfers that timeout around the same time.  However, the
function is not serialized and can race with itself.

When a timeout occurs, hci_dma_dequeue_xfer() stops the ring, processes
incomplete transfers, and then restarts the ring.  If another timeout
triggers a parallel call into the same function, the two instances may
interfere with each other - stopping or restarting the ring at unexpected
times.

Add a mutex so that hci_dma_dequeue_xfer() is serialized with respect to
itself.
Comment 1 Keith Grant 2026-05-08 20:01:02 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050823-CVE-2026-43353-06fc@gregkh/T